<?php

namespace App\Models;

use CodeIgniter\Database\ResultInterface;
use Config\OSPOS;

/**
 * Customer class
 */
class Customer extends Person
{
    protected $table = 'customers';
    protected $primaryKey = 'person_id';
    protected $useAutoIncrement = false;
    protected $useSoftDeletes = false;
    protected $allowedFields = [
        'account_number',
        'taxable',
        'tax_id',
        'sales_tax_code_id',
        'deleted',
        'discount',
        'discount_type',
        'company_name',
        'package_id',
        'points',
        'date',
        'employee_id',
        'consent'
    ];


    /**
     * Determines if a given person_id is a customer
     */
    public function exists(int $person_id): bool
    {
        $builder = $this->db->table('customers');
        $builder->join('people', 'people.person_id = customers.person_id');
        $builder->where('customers.person_id', $person_id);
        return ($builder->get()->getNumRows() == 1);
    }

    /**
     * Checks if account number exists
     */
    public function check_account_number_exists(string $account_number, string $person_id = ''): bool
    {
        $builder = $this->db->table('customers');
        $builder->where('account_number', $account_number);

        if (!empty($person_id)) {
            $builder->where('person_id !=', $person_id);
        }

        return ($builder->get()->getNumRows() == 1);    // TODO: ===
    }

    /**
     * Gets total of rows
     */
    public function get_total_rows(): int
    {
        $builder = $this->db->table('customers');
        $builder->where('deleted', 0);

        return $builder->countAllResults();
    }

    /**
     * Returns all the customers
     */
    public function get_all(int $limit = 0, int $offset = 0): ResultInterface
    {
        $builder = $this->db->table('customers');
        $builder->join('people', 'customers.person_id = people.person_id');
        $builder->where('deleted', 0);
        $builder->orderBy('last_name', 'asc');

        if ($limit > 0) {
            $builder->limit($limit, $offset);
        }

        return $builder->get();
    }

    /**
     * Gets information about a particular customer
     */
    public function get_info(?int $person_id): object
    {
        $builder = $this->db->table('customers');
        $builder->join('people', 'people.person_id = customers.person_id');
        $builder->where('customers.person_id', $person_id);
        $query = $builder->get();

        return $query->getNumRows() === 1
            ? $query->getRow()
            : $this->getEmptyObject('customers');
    }

    /**
     * Initializes an empty object based on database definitions
     * @param string $table_name
     * @return object
     */
    private function getEmptyObject(string $table_name): object
    {
        // Return an empty base parent object, as $item_id is NOT an item
        $empty_obj = parent::get_info(NEW_ENTRY);

        // Iterate through field definitions to determine how the fields should be initialized
        foreach ($this->db->getFieldData($table_name) as $field) {
            $field_name = $field->name;

            if (in_array($field->type, ['int', 'tinyint', 'decimal'])) {
                $empty_obj->$field_name = ($field->primary_key == 1) ? NEW_ENTRY : 0;
            } else {
                $empty_obj->$field_name = null;
            }
        }

        return $empty_obj;
    }


    /**
     * Gets stats about a particular customer
     */
    public function get_stats(int $customer_id)
    {
        $db_prefix = $this->db->getPrefix();
        $totals_decimals = totals_decimals();
        $quantity_decimals = quantity_decimals();

        // Temp Table
        $builder = $this->db->table('sales');
        $builder->select('sales.sale_id AS sale_id, AVG(`' . $db_prefix . 'sales_items`.`discount`) AS avg_discount, SUM(`' . $db_prefix . 'sales_items`.`quantity_purchased`) AS quantity');
        $builder->join('sales_items', 'sales_items.sale_id = sales.sale_id');
        $builder->where('sales.customer_id', $customer_id);
        $builder->groupBy('sale_id');
        $selectQuery = $builder->getCompiledSelect();

        $sql = 'CREATE TEMPORARY TABLE IF NOT EXISTS ' . $this->db->prefixTable('sales_items_temp');
        $sql .= ' (INDEX(sale_id)) ENGINE=MEMORY (' . $selectQuery . ')';
        $this->db->query($sql);

        // Get data
        $builder = $this->db->table('sales');
        $builder->select([
            'SUM(sales_payments.payment_amount - sales_payments.cash_refund) AS total',
            'MIN(sales_payments.payment_amount - sales_payments.cash_refund) AS min',
            'MAX(sales_payments.payment_amount - sales_payments.cash_refund) AS max',
            'AVG(sales_payments.payment_amount - sales_payments.cash_refund) AS average',
            "ROUND(AVG(sales_items_temp.avg_discount), $totals_decimals) AS avg_discount",
            "ROUND(SUM(sales_items_temp.quantity), $quantity_decimals) AS quantity"
        ]);
        $builder->join('sales_payments AS sales_payments', 'sales.sale_id = sales_payments.sale_id');
        $builder->join('sales_items_temp AS sales_items_temp', 'sales.sale_id = sales_items_temp.sale_id');
        $builder->where('sales.customer_id', $customer_id);
        $builder->where('sales.sale_status', COMPLETED);
        $builder->groupBy('sales.customer_id');

        $stat = $builder->get()->getRow();

        // Drop Temp Table
        $sql = 'DROP TEMPORARY TABLE IF EXISTS ' . $this->db->prefixTable('sales_items_temp');
        $this->db->query($sql);

        return $stat;
    }

    /**
     * Gets information about multiple customers
     */
    public function get_multiple_info(array $person_ids): ResultInterface
    {
        $builder = $this->db->table('customers');
        $builder->join('people', 'people.person_id = customers.person_id');
        $builder->whereIn('customers.person_id', $person_ids);
        $builder->orderBy('last_name', 'asc');

        return $builder->get();
    }

    /**
     * Checks if customer email exists
     */
    public function check_email_exists(string $email, string $customer_id = ''): bool
    {
        // If the email is empty return like it is not existing
        if (empty($email)) {
            return false;
        }

        $builder = $this->db->table('customers');
        $builder->join('people', 'people.person_id = customers.person_id');
        $builder->where('people.email', $email);
        $builder->where('customers.deleted', 0);

        if (!empty($customer_id)) {
            $builder->where('customers.person_id !=', $customer_id);
        }

        return ($builder->get()->getNumRows() == 1);    // TODO: ===
    }

    /**
     * Inserts or updates a customer
     */
    public function save_customer(array &$person_data, array &$customer_data, int $customer_id = NEW_ENTRY): bool
    {
        $success = false;
        $this->db->transStart();

        if (parent::save_value($person_data, $customer_id)) {
            $builder = $this->db->table('customers');
            if ($customer_id == NEW_ENTRY || !$customer_id || !$this->exists($customer_id)) {
                $customer_data['person_id'] = $person_data['person_id'];
                $success = $builder->insert($customer_data);
            } else {
                $builder->where('person_id', $customer_id);
                $success = $builder->update($customer_data);
            }
        }

        $this->db->transComplete();

        $success &= $this->db->transStatus();

        return $success;
    }

    /**
     * Updates reward points value
     */
    public function update_reward_points_value(int $customer_id, int $value): void
    {
        $builder = $this->db->table('customers');
        $builder->where('person_id', $customer_id);
        $builder->update(['points' => $value]);
    }

    /**
     * @param $customer_id
     * @param bool $purge
     * @return bool
     */
    public function delete($customer_id = null, bool $purge = false): bool
    {
        $result = true;
        $config = config(OSPOS::class)->settings;

        // If privacy enforcement is selected scramble customer data
        if ($config['enforce_privacy']) {
            $builder = $this->db->table('people');
            $builder->where('person_id', $customer_id);
            $result &= $builder->update([
                'first_name'   => $customer_id,
                'last_name'    => $customer_id,
                'phone_number' => '',
                'email'        => '',
                'gender'       => null,
                'address_1'    => '',
                'address_2'    => '',
                'city'         => '',
                'state'        => '',
                'zip'          => '',
                'country'      => '',
                'comments'     => ''
            ]);

            $builder = $this->db->table('customers');
            $builder->where('person_id', $customer_id);
            $result &= $builder->update([
                'consent'           => 0,
                'company_name'      => null,
                'account_number'    => null,
                'tax_id'            => '',
                'taxable'           => 0,
                'discount'          => 0.00,
                'discount_type'     => 0,
                'package_id'        => null,
                'points'            => null,
                'sales_tax_code_id' => null,
                'deleted'           => 1
            ]);
        } else {
            $builder = $this->db->table('customers');
            $builder->where('person_id', $customer_id);

            $result &= $builder->update(['deleted' => 1]);
        }

        return $result;
    }

    /**
     * Deletes a list of customers
     */
    public function delete_list(array $person_ids): bool
    {
        $builder = $this->db->table('customers');
        $builder->whereIn('person_id', $person_ids);

        return $builder->update(['deleted' => 1]);
    }

    /**
     * Get search suggestions to find customers
     */
    public function get_search_suggestions(string $search, int $limit = 25, bool $unique = true): array
    {
        $suggestions = [];

        $builder = $this->db->table('customers');
        $builder->join('people', 'customers.person_id = people.person_id');
        $builder->groupStart();
        $builder->like('first_name', $search);
        $builder->orLike('last_name', $search);
        $builder->orLike('CONCAT(first_name, " ", last_name)', $search);

        if ($unique) {
            $builder->orLike('email', $search);
            $builder->orLike('phone_number', $search);
            $builder->orLike('company_name', $search);
        }
        $builder->groupEnd();
        $builder->where('deleted', 0);
        $builder->orderBy('last_name', 'asc');

        foreach ($builder->get()->getResult() as $row) {
            $suggestions[] = [
                'value' => $row->person_id,
                'label' => $row->first_name . ' ' . $row->last_name . (!empty($row->company_name) ? ' [' . $row->company_name . ']' : '') . (!empty($row->phone_number) ? ' [' . $row->phone_number . ']' : '')
            ];
        }

        if (!$unique) {
            $builder = $this->db->table('customers');
            $builder->join('people', 'customers.person_id = people.person_id');
            $builder->where('deleted', 0);
            $builder->like('email', $search);
            $builder->orderBy('email', 'asc');

            foreach ($builder->get()->getResult() as $row) {
                $suggestions[] = ['value' => $row->person_id, 'label' => $row->email];
            }

            $builder = $this->db->table('customers');
            $builder->join('people', 'customers.person_id = people.person_id');
            $builder->where('deleted', 0);
            $builder->like('phone_number', $search);
            $builder->orderBy('phone_number', 'asc');

            foreach ($builder->get()->getResult() as $row) {
                $suggestions[] = ['value' => $row->person_id, 'label' => $row->phone_number];
            }

            $builder = $this->db->table('customers');
            $builder->join('people', 'customers.person_id = people.person_id');
            $builder->where('deleted', 0);
            $builder->like('account_number', $search);
            $builder->orderBy('account_number', 'asc');

            foreach ($builder->get()->getResult() as $row) {
                $suggestions[] = ['value' => $row->person_id, 'label' => $row->account_number];
            }

            $builder = $this->db->table('customers');
            $builder->join('people', 'customers.person_id = people.person_id');
            $builder->where('deleted', 0);
            $builder->like('company_name', $search);
            $builder->orderBy('company_name', 'asc');

            foreach ($builder->get()->getResult() as $row) {
                $suggestions[] = ['value' => $row->person_id, 'label' => $row->company_name];
            }
        }

        // Only return $limit suggestions
        if (count($suggestions) > $limit) {
            $suggestions = array_slice($suggestions, 0, $limit);
        }

        return $suggestions;
    }

    /**
     * Gets rows
     */
    public function get_found_rows(string $search): int
    {
        return $this->search($search, 0, 0, 'last_name', 'asc', true);
    }

    /**
     * Performs a search on customers
     */
    public function search(string $search, ?int $rows = 0, ?int $limit_from = 0, ?string $sort = 'last_name', ?string $order = 'asc', ?bool $count_only = false)
    {
        // Set default values
        if ($rows == null) $rows = 0;
        if ($limit_from == null) $limit_from = 0;
        if ($sort == null) $sort = 'last_name';
        if ($order == null) $order = 'asc';
        if ($count_only == null) $count_only = false;

        $builder = $this->db->table('customers AS customers');

        // get_found_rows case
        if ($count_only) {
            $builder->select('COUNT(customers.person_id) as count');
        }

        $builder->join('people', 'customers.person_id = people.person_id');
        $builder->groupStart();
        $builder->like('first_name', $search);
        $builder->orLike('last_name', $search);
        $builder->orLike('email', $search);
        $builder->orLike('phone_number', $search);
        $builder->orLike('account_number', $search);
        $builder->orLike('company_name', $search);
        $builder->orLike('CONCAT(first_name, " ", last_name)', $search);    // TODO: Duplicated code.
        $builder->groupEnd();
        $builder->where('deleted', 0);

        // get_found_rows case
        if ($count_only) {
            return $builder->get()->getRow()->count;
        }

        $builder->orderBy($sort, $order);

        if ($rows > 0) {
            $builder->limit($rows, $limit_from);
        }

        return $builder->get();
    }
}